diff --git a/lib/Browser.js b/lib/Browser.js
index 2555b6a7..8dd074a3 100644
--- a/lib/Browser.js
+++ b/lib/Browser.js
@@ -155,9 +155,8 @@ function waitForRemoteDebuggingPort(chromeProcess) {
     const match = line.match(/^DevTools listening on .*:([\d]+)$/);
     if (!match)
       return;
-    fulfill(Number.parseInt(match[1], 10));
     rl.removeListener('line', onLine);
-    rl.close();
+    fulfill(Number.parseInt(match[1], 10));
   }
 }